Quarterly report pursuant to Section 13 or 15(d)

Organization, Description of Business and Basis of Presentation - 2019 Offerings (Details)

v3.19.2
Organization, Description of Business and Basis of Presentation - 2019 Offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jan. 26, 2019
Jan. 09, 2019
Jan. 31, 2019
Jan. 14, 2019
Class of Stock [Line Items]        
Warrants, number of shares of common stock with right to purchase (in shares)   933,334   933,334
Warrants, exercise price (usd per share)   $ 0.2475   $ 0.2475
Warrants, exercise period   5 years    
H.C. Wainwright, underwriter        
Class of Stock [Line Items]        
Warrants, number of shares of common stock with right to purchase (in shares) 1,065,217 13,333,334 1,065,217  
Warrants, exercise price (usd per share) $ 0.253 $ 0.225 $ 0.253  
Warrants, exercise period 5 years      
Public Offering        
Class of Stock [Line Items]        
Warrants, number of shares of common stock with right to purchase (in shares) 15,217,392      
Warrants, exercise price (usd per share) $ 0.23      
Proceeds received $ 2,975 $ 2,437    
Stock issuance costs $ 525 $ 563